How to identify the Tundra Swan

To correctly identify the Tundra Swan (Cygnus columbianus), check each of these features. Birds can be tricky: habit, habitat, and call often confirm a sighting that a single photo cannot.

Size at a glance

Length

115-150 cm (45-59 in)

Wingspan

170-195 cm (67-77 in)

Weight

3.4-9.6 kg (7.5-21.2 lbs)

Physical features to check

1. 1

   Plumage

   Overall feather coloration and pattern.

   Adult Tundra Swans have entirely pure white plumage. The feathers are dense and provide excellent insulation against cold Arctic conditions.

2. 2

   Beak shape

   Shape and color of the bill: a key field mark.

   The bill is black, relatively short and stout compared to other swan species, with a distinctive yellow patch of varying size at the base, near the eye. The extent of the yellow patch is a key identification feature, particularly in distinguishing it from Bewick's Swan (which typically has more yellow) and Trumpeter Swan (which has an all-black bill).

3. 3

   Eye color

   Iris color and any distinctive eye markings.

   Dark brown

4. 4

   Leg color

   Leg and foot color.

   Black

5. 5

   Distinguishing features

   Standout features that separate this species.

   Pure white plumage, black bill with a variable yellow patch at the base (often tear-shaped or triangular), and a relatively short, straight neck compared to the Trumpeter Swan. The yellow patch on the bill is the most reliable field mark for the North American subspecies.

6. 6

   Juvenile appearance

   How young birds differ from adults.

   Juvenile Tundra Swans (cygnets) have dull, grayish-white plumage, particularly on the head and neck, which gradually whitens over their first year. Their bills are pinkish-black with a black tip, and the yellow patch is absent or very faint. Their legs are also pinkish-gray, darkening to black with age.

7. 7

   Seasonal changes

   Plumage variation between breeding and non-breeding seasons.

   No significant seasonal plumage changes. The plumage remains white year-round. However, during migration and wintering, their white feathers can become stained with rust or brown from iron-rich water or mud, particularly on the head and neck.

8. 8

   Sexual dimorphism

   How males and females differ.

   Males (cobs) and females (pens) are outwardly similar in plumage. Males are generally slightly larger and heavier than females, but this difference is often not discernible in the field.

Key field marks

• Size and Shape. Look for a large, all-white swan with a relatively short, straight neck. It's smaller than a Trumpeter Swan but larger than most geese.
• Bill Color and Pattern. Observe the bill carefully. It will be black with a variable yellow patch at the base, near the eye. The size and shape of this yellow patch are crucial for identification and distinguishing it from other swan species. No yellow indicates a Trumpeter Swan; an orange bill with a black knob indicates a Mute Swan.
• Vocalizations. Listen for their distinctive high-pitched, musical 'whoo-ho-ho' calls, often compared to a clarinet. This is a key differentiator from the deeper, bugling calls of Trumpeter Swans.
• Flight. Note their powerful, direct flight with slow wingbeats, often in V-formations. The whistling sound produced by their wings in flight is also a good clue.
• Juvenile Plumage. Young birds will have grayish-white plumage and pinkish-black bills, gradually whitening and darkening over their first year. The yellow bill patch will be absent or very faint on juveniles.

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